Features 1、The bottom of the switch is made of zinc alloy, which is durable and corrosion‑resistant. 2、This water pump pressure switch controller can withstand high pressure without water seepage, water leakage and other problems. 3、It adopts silver material double contact clutch, ( the contact is 15 sided contact point is more stable than single point contact ). 4、The double contact clutch can ensure the strength of the switch, and the quality is more stable and reliable. 5、This switch is suitable for automatic cold and hot water self‑priming booster pumps of major domestic and foreign brands. Specification Item Type: Water Pump Pressure Switch Material: Zinc Alloy Specification: 1.5~2.2kg ( Suitable for 250W 300W 370W ) Interface Thread Specification: 3 / 8in Product Use: Automatic Cold and Hot Water Self Priming Booster Pumps of Major Domestic and Foreign Brands, for Internal and External Threaded Elbows. Package List 1 x Water Pump Pressure Switch